FINANCING ACTIVITIES - Schedule of Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool (Details) - Utility	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
AEP Texas
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.70%	5.71%
Average Interest Rate for Funds Loaned	0.00%	0.00%
AEPTCo
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.68%	5.72%
Average Interest Rate for Funds Loaned	4.69%	5.70%
APCo
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.70%	5.74%
Average Interest Rate for Funds Loaned	4.69%	5.72%
I&M
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.70%	5.73%
Average Interest Rate for Funds Loaned	0.00%	0.00%
OPCo
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.66%	5.71%
Average Interest Rate for Funds Loaned	4.70%	0.00%
PSO
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.67%	5.71%
Average Interest Rate for Funds Loaned	4.70%	0.00%
SWEPCo
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.69%	5.71%
Average Interest Rate for Funds Loaned	0.00%	0.00%